Oil-burning apparatus



M. RESEK ET AL OIL BURNING AIfPARATUS y Filed June 24, 1925 9 SheetS-Sheeb l l... llllllllulllfdllL 9 Sheets-Sheet 2 M RESEK ET AL` GIL BURNING APPARATUS F'lled June 24, 1925 Oct. 23, 1928.

1,688,435 M. RESEK ET AL OIL BURNING APPARATUS Filed June 24, 1925 9 Sheets-sheet 3 Oct. 23, 1928.

Oct. 23, 1928. 1,688,435

M. RESEK ET AL OIL BURNING APPARATUS Filed June 24, 1925 9 Sheets-Sheet 4 Oct. 23, 1928. 1,688,435

M. RESEK ET AL OIL BURNING APPARATUS Filed June 24, 1925 9 Sheets-Sheet 5 M. RESEK r-:T AL

CIL BURNING APPARATUS Filed June 24, 1925 9 Sheets-751166?. 6

Oct. 23, 192s. t 1,688,435'

M.RESEK TAL OIL BURNING APPARATUS Oct. 23, 1928.

M. RESEK ET AL OIL BURNING APPARATUS Filed June 24, 1925 9 Sheets-Sheet 8 Oct. 23, 1928.

M. RESEK ET AL OIL BURNING APPARATUS Patented Qdi.A 23,1192-8. l

UNITED STATES PATENT OFFICE.

MARC RESEK, OF CLEVELAND HEIGHTS, AND JOHN ALGER DAHLSTROM, OF EAST CLEVELAND, OHIO, ASSIGNORS TO PERFECTION STOVE COMPANY. OF CLEVELAND,

OHIO, A CORPORATION OF OHIO.

OIL-:BURNING APPARATUS.

Application `filed June 24, 1925. Serial No. 39,236v

This invention relates to improved oil burning apparatus that is characterized by means for varying the oil level with respect to the burner thereby to. control the size of the flame and consequently the heat produced by the apparatus.

In the present preferred form of the invention, a burner of the injector type is employed and it is actuated by fluid having a substantially constant pressurej and the oil level in the burner is governed by thermostatically controlled mechanism thereby to change the heat produced by the burner according to the changes in temperature affecting the thermostat. Y

In a more complete embodiment of the invention, a plurality of burners are employed, and certain ones of these are thrown into and out of operation successively as the demand for heat increases and decreases.

However, in more general terms, the invention may be defined as consisting of the com-` bination of elements set out n the claims annexedhereto, and the main objects sought to be attained may be enumerated as follows:

To provide a highly efficient'oil burning apparatus that is economical from the standpoint of fuel consumption and is automatic of operation and is thoroughly reliable;

To provide oil burning apparatus in which the ame is controlled by varying the oil level with respect to the'burner and preferably to employ automatic means for effecting changes in the oil level;

To provide a thermostatic control for the automatic means whereby the temperatures affecting the thermostat determine the output of heat by the aj'iparatus;

To provide, in oil burning apparatus, a tank, a reservoir to which oil is pumped from the tank. the reservoir supplying fuel to the burner and havingY an overflow ofvariable height which returns excess fuel to the tank., aud automatic means for changing the elevation of the overflow thereby to control the burner flame:

'Fo provide in 'apparatus of the character immediately above described. a burner of they injector type. and a steam generator for supplying the actuatingl fluid for the burner, together with a steam pump operated by steam from the generator' for circulating the fuel through the reservoir from the tank; and

'Eojnovide in apparatus 0f the character aforesaid one or more auxiliary burners that is or are automatically thrown into operation as the temperature affecting the thermostat drops below a predetermined value and is or are thrown out of operation when the temperature resumes this predetermined value, the means for accomplishing this result being under the control of the mechanism for varying the fuel level.

Referring now to the accompanying draw- .ings which constitute a part hereof and wherein similar reference characters designajte corresponding parts throughout the several views, Fig. l is a front elevation of an oil (burning apparatus embodying our invention; Fig. 2 lis a transverse section through the apparatus on the line 2--2 of Fig. 4l; Fig.

3 is a right hand side elevation of the apparatus; Fig. t is a central longitudinal section through the apparatus as though viewed from the side opposite t-hat from which Fig. 3 is taken; Fig. 5 is an enlarged vertical section through the control valves of the auxiliary burners and through the oil reservoir with its variable overflow and the mechanism for adjusting said overflow, the View being taken on the line 5 5 of Fig. 3; Figs. 6, 7, 8 and 9 are sections on the respective correspondingly numbered section lines of Fig. 5; Fig. 10 is a planview of the oil reservoir and mechanism shown in Fig. 9; Figs. 11 and l2 are views at right angles to each other of one ofthe p-awl carrying plates included in the mechanism of Fig. 9; Figs. 13 and l/l are a side elevation and a plan, respectively, of one of the pawls of said mechanism; Fig. 15 -is a wiring diagram of the electric vcircuit through which the mechanism controlling the oil level of the reservoir is automatically governed by a thermostat'; Fig. lo is a diagrammatic representation of a modification of the invention; and Fig. 1T is a sectional side elevation of a further modification. i

The oil burning apparatus is intended for use in conjunction with house heating and other furnaces and is designed to be positioned in front of a door of the furnace, as in front of the ash pit door (the regular coal burning gratos being removed) so that the products of. combustion from the apparatus are projected into the fire box for heating the furnace. ln Figs. 3 and .4 a portion of a furnace is shown, the same being designated A,

and, as revealed in the sectional view of Fig.

4 its front wall is provided with an opening a through which the products from t-he combustion chamberof the apparatus are projected into the tire boX a. The furnace Inay be of the steam boiler, hot water, or hot air class; and it may be explained at this time that our invention is applicable to many other purposes than to the operation of heating plants of the classes mentioned.

Our improved oil burning apparatus, designated generally by the reference numeral 1,

is supported upon ,legsv 2, and it comprises a metallic box like casing 3 to one side of which is hinged, as at 4, a cover 5. Disposed transversely of the bottoml portion of the casing 3 is a preheating burner 6, the same being` shown as in the nature ot a basin into which a quantity ofl liquid fuel may be introduced through a filling spout 7 (Figs. 1 and 2) air to support combustion being admitted through a passageway 8 and a series of tubu lar bosses 9 which project above the surface 'of the oil. An opening 10 inthe side of the l compartment 20 the top of which is formed by a shell 21 that is shown as spaced from and J secured tothe cover 5, as by bolts 22. 1t de- A terlal.

sired, the space between the shell and cover may be filled with suitable heat insulating ma- At its rear end, the compartment 20 communicates with the interior of the furnace through the top portion of the opening a.

,i surrounded by a metal frame 23. v'extends about the upper side of this frame The upper end of the passageway 18 is A bead 24 and is spaced a suitable distance from the edge thereof, and adapted to rest upon the frame, inwardly of the bead 24, is a damper 25. This damper is made up of a metal frame 26 that carries a body of refractory material.

Situated within the rear end of` the com' partment 20, where it may be exposed to the products ot combustion escaping through the passageway 18 from the combustion chamberl when the damper 25 is open, is a steam generator 28, shown as provided with heat abstracting vanes 29. The generator is closed at one end, and at the other is flanged (Fig. 2) for connection with a oat -chamber 30 which has a removable cover 31 that is shown as held in place by yscrews 32 which bind the peripheral langes of the chamber and cover together.

A )Vater is admitted to the loat chamber and to the generator through a pipe 35 and is maintained at a substantially constant level therein by a suitable valve (not shown) that is controlled by a float 3G that occupies the fioat chamber.

The end wall of the steam generator 28 opposite the float chamber 30, is provided adjacent its top with a hollow boss 40 and adjacent its lower edge with a similar boss 41. A nipple 42 is screwed into the boss 40 and at its outer end carries a steam dome 43. Steam is led from the steam dome through pipes 44, 45 and 4G (Fig. 3) to the middle section 50 of a multiple oil burner designated generally by the reference numeral 51. Each section of this burner is constructed, as shown in Fig. 4, oi' a steam nozzle 52 and an oil nozzle 53 that are sustained in proper relation to veach other by a trame 54 to which said nozzles are clamped by a head 55 that is .held iirmly in place by a nut 5G threaded on the outer end ot' a stud 57 that is `carried by the frame 54. i

The pipes which supply steam to the various sections of the burner are connected by unions 58 to the upper ends of the frames 54, and oil is supplied to the burner sections through tubes which are connected to the lower ends of the frames by unions 59. It will be understood that the bores of the bosses to which the unions 58 and 59 are applied communiu cate with the'bores of the respective nozzles 52 and 53. This construction provides a simple and highly etlicient oil burner of the injector type.

The burner section 50 constitutes what we f may term the main burner, while sections designated GO and 61 constitute auxiliary burners. to a valve casing 63 (Figs. 3, 5, 6 and 8) and within the casing are two valves 65 and (5 6 which control the respective portsy 67 and y68 that communicate through pipes (i9 and 7 0 with the respective burner sectionsor auXil- A branch 62 leads from the pipe 45 iary burners 60 and 61. Each of the valves..` 65 and 6G has a stem which is guided within a bore of the casing and depends a suitable distance below the lower end of the casing, the stems being of dlfferentleugths, as shown in Fig. 5, for a purpose which will presently appear.

A branch 75 leads from the pipe 45 to a steam operated pump 76 which may be of any approved type, the one illustrated being a piston pump, and without going Yinto detail in the description otl its construction it which the apparatus stands) to the inlet side iis of the pump, and from the outlet side of the pump a pipe 83 leads to the bottom of an oil reservoir 84, shown in detail in Figs. 5, 6 and 7.

The oil reservoir 84 is shown as consisting of a box like casting having a transverse partition 85 which divides the interior of the reservoir into compartments 86 and 87. Formed within one of the lower corners of thel compartment 87 is an elongated tubular boss 88 within which an overflow tube 90 has a sliding fit, the tube being provided a suitable distance upwardly from its lower end with an overflowopening or openings 91. 1n axial alignment with the boss 88 is an external boss 92 into which the upper end of a pipe 93 is threaded, said pipe leading to the fuel tank 82. rIhe overfiow tube 90 has a trombone connection with the pipe 93 as will be readily understood from the construction described. Suitably attached to one side of the overflow tube 90 is a rack 95 the lower portion of the rack being spaced from the tube to allow it to descend alongside the boss 88 when the tube is in its lowermost pt, .tion. Cooperating with the rack 95 is a pinion 96 of suitable design which is secured to the inner end of a shaft 97 that is journaled in a bearing 98 shown as formed integral with a plate 99 that closes an opening in the side of the reservoir 84, the same being secured in place by screws 100. @utwardly beyond the beari ing 98 and within the lower portion of a housing 101 a gear 102 is secured to the shaft 97, and journaled upon the shaft on opposite sides of the ge-ar 102 are pawl carrying plates Pivoted at 10/1 to the plates 103 are pawls 105, shown in det-ail in Figs. 13 and 14. The-free ends of the pawls are turned laterally to provide portions 106 which are adapted to engage the teeth of the gear 102 when the pawls are swung upwardly from the stops 107 that are formed on the plates 103 and serve to sustain the pawls in normal position. The

Yit will first swing the corresponding pawl 105 into engagement with the teeth of the gear 102 and further movement of the core will elevate the corresponding pawl carrying plate 103, rotating it about the shaft 97, and

l with it, the gear 102 to impart like'movement to the shaft to which the gear is secured.

driving connection with the overflow tube through the rack and pinion 96. The top of the housing 101 is closed by a cover 115 that is secured to the upper end of the housing by screws 116. The fixed portions 112a of the cores of the solenoids and 111 are fastened to the cover 115 by screws 117. As a convenient mean's for manually adjusting the overflow tube 90, the shaft 97 is projected outwardly through an aperture in a faceplate 118 which closes the open front of the lower portion of the housing 101, andat its outer end the shaft is equipped with a hand wheel 120. Then the pawls 105 are in normal position, the shaft is free to be rotated by the lia-nd wheel 120 and through the connections above described adjust the overflow tube 90. As will hereinafter appear there are circumstances under which it is desirable to raise the oil level in the reservoir 84 more quickly than would be accomplished by the automatic means provided for the purpose and involving the solenoids and mechanism associated therewith.

Carried by the upper end of the ov/erflow tube 90, where it projects through an opening in the cover 122 which is removably secured to the upper end of the reservoir 8a by Screws 123, is a button 125 that is arranged to engage the stems of valves 65 and 66. It will be noted that the stem of valve 65 is somewhat longer than the stem of valve 66 so that as the tube is elevated, the former valve will first be lifted from its seat and by continued movement ofl the tube the latter valve will be lifted and bo'th valves held un seated.

The respective compartments 86 and 87 of the reservoir 84 have, adjacent the bottom of the reservoir, outlet openings 127 and 128, the former having connected to it a tube 129 which leads to a manifold 130 that has connection throueh the tubes 131 and 132 with the auxiliary burners 60 and 61. The outlet opening 123 'of compartment 87 is connected through a tube 135 with the main burner 50. inasmuch as oilis delivered fromrthe pump 7 6 through the tube 83 directly to the compartment 86, the oil overflows therefrom into compartment 87, the compartment 86 thus being maintained full of' oil and as a consequence thereof the oil level in the oil lines leading to the auxiliary burners 60 and 61- is maintained at its maximum height at all times. rlhe oil level in compartment 87 is dependent upon the elevation of the over flow opening 91 of the tube 90, and inasmuch as the main burner is supplied with oil from this compartment, the level of oil in the oil liple 135 leading to the main burner is varia e.

The actuation of the solenoids 110 and 111 is controlled by a thermostat shown conventionally in the wiring diagram of Fig. 15.

1t will be remembered that the' shaft 97 has Sustained by a base 138 is a thermostatic elelilo ltlfl lzil:

free end of the tongue swings between adjustable contacts 142 and 148 on a. plate 144 that is pivoted at 145 to the base. By swing,

ing the plate 144 kon its pivot, the contacts 142 and 143 may be4v shifted simultaneously and without disturbing their relative adjustnient to cause the thermostat to act at different temperatures, accordingly as a pointer 146 on the plate 140 is set with respect to a Scale 144 on the base. From a source 150 of electric energy represented conventionally as a battery, current is led through a cone ductor 151 to the thermostatic element 139 and tongue 149. lf the tongue swings to the right, by reason of a rise in temperature affecting the thermostatic element 189, far enough to engage the contact 142, the flow of current continues'on through a conductor 152 to the winding of solenoid 110 and thence through a branched conductor 153 to the ground. Upon the occasion of a drop in'tenr perature sufficient to cause the tongue 140 to swing into engagement with contact 143,A

the current will be directed through a conductor 154 to the wiring of solenoid 111 fromwhich it passes on through the conductor 153 to the ground. In order to produce reciprocations of the solenoid cores it is necessary to intermittently close the circuit which energizes the solenoids, and to this end an .intermittently acting switch of any approved type may be employed. In the presentl instance, a switch is provided that is intermittently operated by the oil pump 7 6. This switch consists of a contact member 155 that is carried by the piston rod 77 and the saine is arranged for engagement with a fixed contact member 156 that may be supported by, but insulated from, the casing 3 of the apparatus. fr conductor 157 leads from the source of electric energy or battery 150 to 'Contact member 155 while contact member explained that the inner end of the damper 25 is connected, through a link 160, to the inner end of a lever 161 that is fulcrumed aty 162 on a support 163 that is carried by an adjacent portion of the casing 3. Thilo the section of the lever which is housed within the easing 3 is preferably formed of a Acasting its outer end is constituted of rods 164'whieh extend through a suitable opening in the front of the casing. A weight 165 adapted to be adjusted along the rods 164 to normally over-balance the damper 25, the

weight being adapted to be locked in any adjusted' position by a set screw 166. Sustained by a bracket 149, with its axis a short dis- -tance inwardly of the fulcrum of the lever,

is a bellows 171, and `a thrust Apin 172 is in- .terposed' between the free end ofx the bellows and a depressed seat in the lever 161. The bellows 171 communicates,through a pipe 174, with the lower portion of the generator 28. Consequently, steam pressure within the generator is communicated to the bellows and when such pressure becomes great enough to overcome the action of the weight 165 it will depress the lever and close the damper 25.

In considering the operation of the above described form of the invention, let-it be. assumed that oil is presentl in the system, and that while it stands at maximum level in the auxiliary burners 60 and 61, that/it is at a level in the main burner 50 determined bythe position of the overflow opening 91 ofthe tube 90. It will also be assumed that water vit is deflected rearwardly by the damper 25 toward and aboutthe generator28. This `causes steam to be generated which is conducted through pipes 44, 45 and 46 to the main burner 50, throwing said burner into operation. As this burner continues in action, it supplies the heat for the generator 28 and as the steam pressure within the generatorI continues to rise the flame naturally increases. The higher steam pressure however, acts also through the bellows 171 to depress the damper and thus shield to a'greater or lesser extent the generator from the heat ofthe flame. Tt is apparent that the opening 18 is in eifect a byfpass for only a part of the flame, the major portion of the Afla-me at'all times issuing through the combustion chamber 16 to the fire box a of the furnace, and even when the damper 25 is open the porr tion yescaping through the passageway 18 ultimately' reaches the furnace through the upper portion of the opening a.

The thermostat 138 may be located in an y apartment which is being heated by the furnace, or in an oven fired by the apparatus,

ior in any other place where it is under the influence of the heat created by the apparatus. Tn case the heat affecting the thermostat becomes great enough tolcause the tongue 149 to engage the contact 142, a circuit will be established through the path.. previously describedincluding the winding of solenoid 110. Then, upon the. intermittent enga gement of the contact me1nbers'155 and 156. caused by' the action of the pump 76, pulsations of current Awill be directed through the solenoid to reciprocate its movable core section and consequently to rotate, in the manner already de- C scribed, the shaft 97 and the pinion 96 in a direction to feed the rack 95 and the overlow tube 90 by which it is carried downwardly, thus lowering the oil level within the compartment 87 of the reservoir and consequently' within the oil line leading to the main burner. As a result ot/this condition less oil is expelled from the burner and consequently the temperature ot the iiame drops which will have the effect of lowering the temperature which operates the thermostat. IThe tongue 140 will then withdraw from the contact 142 and the apparatus will continue to operate at the prevailing oil level until there is a possible drop in the temperature sufficient to cause tongue 40 to engage the contact 143. When this happens, the current is directed through conductor 154 to the winding ot' solenoid 111 and thence through the wire 153, the ground, the wire 158, the intermittent switch comprised of contact members 155 and 156, and the conductor 157to the source or battery.

`When solenoid 111 is thus energized, it acts, through the corresponding pa-wl 105 wherewith it has connection, to rotate theshat 97 in the opposite direction and elevate the tube 90 and cause a corresponding rise in the oil level within the oil line leading to the main burner;

Now let it be supposed that even when the oil level in t-he compartment 87 approaches its maximum height the temperature affecting the thermostat is not sufficiently high to retract the tongue 140 from the contact 143. lUn-der such a condition as'this it is necessary to throw into operation one or both of the auxiliary burners. This is accomplished by the engagement ofthe button v145 that is carried by the upper end of the overflow tube 90 with the stem of valve 65 and the lifting of the valve byy the continued slight upward movement nt the tube. As soon as the valve is open, steam rushes through the pipe 69 to the burner 60 and sets said burner in operation; and if the heat is still insufficient to cause the retraction of the tongue 140, the tube 90 will continue to rise and open the valve 66 and thus throw burner 61 into operation.

lhe burners will then continue to operate at their maximum capacity until there is a rise in temperature suficient to swing the tongue 140 in engagement with the contact 141, energizing the solenoid 110 which is responsible for the lowering of the tube 90.

F ig. 16 represents diagrammatically a moditication ot our invention wherein the oil reservoir is movedbodilyup and down to vary the oil level with respect to the burners.

175 represents a shaft which is suitably supported for oscillation and to which is fastened a ratchet 176 and a lever 177. rlhe ratchet has reverse teeth on its opposite edges, and V notches across its top. 'llhe lever 177 carries an oil reservoir 180 at one end, and a counterbalancing weight 181 at the other.

.lt also` includes a depending arm 182 Athat is provided, on its lower edge1 with cams 183 and 184.r

A steam line 185 which is the equivalent of the steam line represented by pipes 44 and y 45 of @the previously described embodiment ot the invention leads from the steam generator to a valve casing 186 containing valves 187 and 188 which are, respectively, equiva lents of the valves 65 and 66, of the former embodiment. These valves control the admission of steam to pipes 189 and 190 which lead, respectively, to the auxiliary burners 191 and 192. 'lhe main burner 193 receives its supply ot' steam through a branch 194 of' veyed from the receptacle 180 to the main burner 193 through a pipe 200, and through a pipe 201 to 'a manifold 202 which supplies, through the tubes 203, the auxiliary burners 191 and 192.A

rlhe cores of solenoids 210 and 211, which are equivalents of the former solenoids 110 and 111, are connected, through links 212 with arms 213 that are journaled on the shaft 175 on opposite sides of the ratchet 176. Pawls 214, that are connected to these arms, cooperate with the teeth that are formed on the opposite edges ot' the ratchet 176. rlhe pawls are normally held out ofthe path of the teeth by suitably'supported stationary stops 215.

W'hen the solenoid 210 is energized it will lii't the corresponding arm 213 and throw the pawl carried thereby into engagement with the ratchet 176, at the same time withdrawing a locking device 217 from engagement with the V notches of the ratchet thereby releasing the ratchet and the lever. cause a rotation ot' the ratchet, and .consequently the lever, in a direction to elevate the reservoir 180 and raise the oil level in the oil lines ot' the burners. As the parts are shown in the diagram, the same movement oit' the lever.177 will. result in engaging cam 183 with the stem ot' valve 187, depressing said valve and throwing into operation burner 191. l4`urther. .movement of the lever in the same direction will result in unseating valve 188 and directing steam t0 the second auxiliary burner 192. Energization of the solenoid 211 will reverse the operation, cut out the auxiliary burner-s and lower the oil reservoir 180, continued movement in this direction beyond the position shown in the drawings, lowering the oil level in the main burner and causing the heat of its flame to be reduced.

This will l Through the modification illustrated in Fig. 17, we accomplish with one burner what has practically been accomplished withy a plurality of burners in the foregoing forms ofthe invention. In the present modification the burner is designated 220, and it issupplied with steam from the generator 201 through the pipe 222. The burner is supplied with oil through the pipe 223 from a reservoir 225 that receives its oil from the pump through a pipe 226, The reservoir has an overflow 227 which returns the excess oil tln'ough pipes 228 and 2,29 to the oil tank. The reservoir 225 lis equipped with a suitable number otl ears 230 which are guided on rods 231 that risc from a base 232, and springs 233 surround said rods and are interposed between the ears 2.90 and nuts 234 that are carried by and adapted to be adjusted along the upper ends of the rods. These springs tend to lower the reservoir in opposition to a bel-l lows 235 which supports the reservoir and rests upon the base 232 and communicates, through a pipe 236, with th-e steam generator 221.

A bellows 240 is connected through a branch 241 with the pipe 236 and tends, as in the first described form of the invention, to depress a lever 242 whichhas connection at its inner end, through a link 243, with the inner end of a damper 244 which controls the passage of a part of the products of combustion from the combustion chamber 245 through an opening 246 to the compartment enclosing the generator 221.

Supported upon the outer end of the lever 242,is electromagnetic mechanism 248 which may be identical with that disclosed in a copending application filed April 18th, 1925, by Marc Resek, one of the present applicants, and bearing Serial No. 24,052. This mechanism involves adjustable weights which are moved inwardly and outwardlywith respect 'to the Vfulcrum of the lever 242 by solenoids iwhich are under ythe control of a thermostat,

precisely as the solenoids 110 and 111 are under the control of the thermostat shown in connection with the first described form ofthe resent invention.

When this form of the invention is in operation, steam is conducted through the pipe 222 to the burner 220 to suck from the oil line 223 a quantity of oil depending upon, first, the steam pressure and, secondly, the level of the oil with respect to the burner.

By reference to the above mentioned application, it will be seen that when the temperature affecting the thermostat falls, it will shift the center of gravity of the mechanism 248 outwardly with respect to lthe fulcrum of the lever 242 and this will tend to lift the damper 244 so as to enlarge theI opening for the products of combustion passing from the combustion chamber to the generator and this will result in increasing the steam pressure within the generator, which steam pressure will be communicated through the pipes 286 and 241 to the bellows 240 and 235. The former bellows will tend to depress the lever and move the damper toward closed position; while the latter bellows will tend to elevate the oil reservoir 225 and thus raise the oil level with respect to the burner. Asa consequence of this action, greater steam pressure and a freer supply of oil will be delivered to the burner so that the flame of the burner increases. The steam pressure and oil level will continue to rise so long as the center of gravity of the weight mechanism 248 is moved outwardly, and upon the reversalofthe conditions responsible for the shifting of said weight, the center of gravity of said mechanism 24S will be moved inwardly, and both the steam pressure and the oil level will be lowered.

This embodiment of the invention, therefore, provides a much wider range of adjustment for a single burner than is afforded by the former modifications,`rendering the auxiliary burners unnecessary.

Having thus described our invent'on, what we claim is z- 1. In oil burning apparatus, the/combination of a burner of the injector'type, a steam generator subjected to thev heat of the burner flame, pressure actuated means operated by steam from the generator for maintaining the pressure therein substantially constant, a con-n duit leading from the steam generator to the burner, an oil tank, an oil reservoir having an overflow that drains into said tank, a pump operated by steam from the generator for pumping oil from thetank to the reservoir, and thermostatically controlled means subjected to the heat produced by the apparatus for changing the relation between the burner and the oil level in the reservoir.

2. In oil burning apparatus, the combination of a main burner and an auxiliary burner, said burners being of the inje tor type, a source of' pressure fluid, conduits leading from said source to the burners, the conduit leading to the auxiliary burner having a valve, an oil reservoir, means `for supplying said reservoir with oil in amount equal to oil' in excess ofthe maximum demand of' the burners, and means for changing the relation between the main burner and the oil level of the reservoir and through which means the aforesaid valve is opened when the oil level reaches a predetermined height with respect to the main burner.

3. lln oil burning apparat-us, the combination of? a main burner and an auxiliary burner, said burners being ot the injector type, a steam generator subjected to a source ot' heat, conduits leading 'from the generator to the burners, the conduit. leading to the auxiliary burner having a. valve, an oil reservoir, means for supplying said reservoir with oil in amount equal to or in excess of the maximum demand of the burners, the reservoir having an overflow, means for changing the height of the overflow with respect to the burners, and connections through which the aforesaid valve is opened when the overflow reaches a predetermined height.

4. In oil burning apparatus, the combination oi'' a main burner and an auxiliary burner, said burners being of' the injector type, a steam generator subjected to a source oi heat, conduits leading from the genera-tor to the burners, the conduit leading to the auxiliary burner having a valve, an oil reservoir, means for supplying said reservoir with oil in amount equal to or in excess of the maximum demand of the burners', the reservoir having an overflow, means affected by the heat produced b v the burners for automatically changing the height of the overflow with respect to the burners, and connections through which the aforesaid valve is opened when the overilow reaches a predetermined elevation.

In oil burning apparatus, the combina.- tioii of' a main burner and an auxiliary burner, said burners being of the injector type, a steam generator subjected to a source of heat, conduits leading from the generator to the burners, the conduit leading to theauxiliary burner having a valve, an oil reservoir, means for supplying said reservoir with oil in amount equal to or in excess ot' thel maximum demand of the burners, Lthe reservoir having an overflow, and means responsive to changes in ten'iperature vfor varying the height of the overflow with VKrespect to the burners and for opening-the aforesaid valve when the said overflow attains apredetermined elevation.

G. In oil burning apparatus, the combination of a. main burner and an auxiliaryburner,

said burners beingot the injector type, a source of pressure fluid, conduits leading from said source.' to said burners, a valve Iin the conduit leading to the auxiliary burner, an oil reservoir, means for supplying oil to the "reservoir in amount equal to or inexcess of the v-inaximum demand of the burners, the reservoir having an overflow, and means for changing the height of the overflow with re- .spect to the burners and for opening the aforesaid valve when the overflow attains a predetermined height.

7. In oil burning apparatus, the combina-v tion of a main burner and a plurality of auxiliary burners, said burners being of the injector type, a source of pressure fluid. conduits leading from said source to said burn'- ers, valves in the conduits, leading to the auxiliary burners, an oil reservoir, means for supplying oil,to theY reservoir in amount equal to or in excess of the maximum demand of the burneis, the reservoir having an overflow, and means affected by the heat produced by the apparatus for changing the height of the overflow with respect to the burners and Lfor o Jenin the aforesaid valves successivel when the overflow attains predetermined heights.

8. In oil burning apparatus, the combination of a burner of the injector type, a steam generator supported in operative relation to the burner, a conduit leading from the generator to the burner, means responsive to the steam pressure within the generator for governing the amount of heat delivered to the generator, an oil reseivoir having an overflow, and mea-ns responsive to temperature changes and subjected tofheat produced by the apparatus for varying the height'or' the overflow with respect to the burner.

9. In oil burning apparatus, the combination of a burner of the injector type, a steam generator for supplying steam thereto and situated in operative relation to the burner, means responsiiv'e to the steam pressure in the generator for maintaining the pressure substantially constant, an oil reservoir, a con- Y duit leading from the reservoir to the burner, the reservoir having an overflow, and

means responsive to temperature changes for varying the height of the overflow with ref spect to the burner.

l0. In oil burning apparatus, the combination of a burner of the injector type, a steam generator for supplying steam thereto and situated in operative relation to the burner,

means responsive to the steam pressure in the generator for maintaining the pressure substantially constant, an oil reservoir, a conduit leading from the reservoir to the burner, and means responsive to temperature changes for varying the oil level in the reserl voir thereby to regulate ther burner flame.

11. In oil burning apparatus, the combination of a burner of the injector type, asource of pressure fluid, a conduit leading from said source to the burner, an Yoil reservoir, a conduit leading from the oil reservoir to the burner, said reservoir having an oveflow,

mechanism that is operable in one direction"- to elevate the overflow and in 4another direction to lower the overflow with respect to the burner, electromagnetic means for operating said mechanism in each of the aforesaidA directions, a source of electric current, a branched circuit including said source, each branch including one of the said electroinagnetic means, a thermostatic switch in said circuit for selecting one of the other of said branches, and an intermittently acting switch in the circuit.

12. In oil burning apparatus, the combination of a main burner and an auxiliary burnver, both burners being of the injector type, a

source of pressure fluid, conduits leading from said source to said burners, a valve ineluded in the conduit leading to the auxiliary burner, an oil reservoir, a conduit leading from said reservoir to the burner, means for delivering oil to the reservoir in amount equal to or in excess of the maximum demand of the burners, means for vertically adjusting the overliow, and 'connections through which the aforesaid valve is opened when the overflow has attained a predetermined elevation.

13. ln oil burning apparatus, the'combination of a. main burner and an auxiliary burner, both burners being of .the injector type, a source et pressure luid, conduits leading from said source to said burners, a valve included in the conduit leading to the auxiliary burner, an oil reservoir, a conduit leading from said reservoir to the burner, means for delivering oil to the reservoir in amount equal to or in excess of the maximum demand ot the burners, means respensive'to temperature changes and subjected to the heat produced by the apparatus for vertically adjusting the overflow, and connections through which the aforesaid valve is opened when the overlow has attained a predetermined elevation.

14. ln oil burning apparatus, the combination of a main burner and an auxiliary burner, both burners being ot the injector type, a. source of pressure fluid, conduits leading from said source to said burners, a valve in the conduit leading to the auxiliary burner, an oil reservoir having two compartments, means for delivering oil to the irst of said compartments and from which compartment the oil overflows into the second compartment, the second compartment having a. vertically vadjustable overflow, a conduit leading Yfrom the first of said compartments to the auxiliary burner, a conduit leading trom the.

second of said compartments to tbe main burner. means for vertically adjustingl theoverflow` and connections through which the aforesaid valve is opened when said overflow has attained a predetermined yelevation.v j

l5. ln oil burning apparatus, the combination of a main burner and an auxiliary burner, both burners being of the injector type, a steam generator situated in operative relation to the burner, means responsive to the steam pressure in the generator for governing the amount of heat delivered to the generator, conduits lea-ding 'from the steam generator re'aaasa to the burners, a valve in the conduit leading to the auxiliary burner, an oil reservoir having two compartments, an oil tank, a pump oper-ated by steam from the generator for pumpingr oil from the tank to the irst comv partment ot' the reservoin, the said lirst compartment overflowing into the second compartment, a vertically adjustable overflow for the second compartment which discharges into the tank, a. conduit leading from the iirst compartment to the auxiliary burner, a conduit leading from the-second compartment to the main burner, means responsive to temperature changes and subjected to the heat produced by the apparatus for raising and lowering the said overiow, and connections through which the aforesaid valve is opened when the overflow has attained a given elevation.

16. ln oil burning apparatus, the combination of a burner of the injector type, a steam generator subjected to a source ot heat, means for maintaining a substantially const ant steam pressure in the generator, a conduit leading `irom the steam generator to the burner, an oilreservoir, a conduit leading from the reservoir to the burner, and thermostatic means subjected to the heat produced by the apparatus for automatically varying the oil level olt the reservoir with respect to the burner.

17.' lin oil burning apparatus, the combination of a steam generator subjected to a source of heat, an oil burner of the injector type,a conduit leading from the steam generator to the burner, an oilreservoir, a conduit leading from said reservoir to the burner, 'means for varying the steam pressure in the generator, and means operated by the variable pressure in the generator -itor raising the oil level` of the reservoir with respect to the burner as the steam pressure within thegenerator increases.

.ln testimony whereof, fix our signatures.

Mano nissart. a. arena nanrsfrnoi/i.

we hereunto af- 

